S-(N-alkoxycarbonyl, N-substituted)aminomethyl isothiourea derivative

ABSTRACT

S-(N-alkoxycarbonyl, N-substituted)amino methyl isothiourea derivative, which is a useful intermediate for the production of 1,3,5-thiadiazine-4-one derivative, is disclosed. The above compound can be produced by reacting the carbamate compound of the formula(II) with the thiourea compound of the formula(III).

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to the novel S-(N-alkoxycarbonyl, N-substituted)amino methyl isothiourea derivative of formula (I) ##STR1## wherein each of R¹, R², R³, R⁴, R⁵ and R⁶, which may be the same or different, represents an alkyl group, an alkenyl group, an alkynyl group, a haloalkyl group, a haloalkenyl group, a haloalkynyl group, an alkoxyalkyl group, a cycloalkyl group, a cycloalkenyl group, an aryl group, a substituted-aryl group, an aralkyl group, a substituted-aralkyl group, a naphthyl, a pyridyl, ##STR2## (wherein each of X¹, X² and X³, which may be the same of different, represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, an acetyl, a haloalkyl group, a halogen atom, CF₃, NO₂, hydroxy, a benzyl group, a phenyl group, a phenoxy group, a phenylthio group, a benzyl- or halogen-substituted benzyl, phenyl, phenoxy or phenylthio group) or ##STR3## (wherein each of Y¹ and Y², which may be the same or different, represents a hydrogen atom, a lower alkyl group, a halogen atom, CF₃, a lower alkoxy group, W represents a ##STR4## group, (in which each of R⁷ and R⁸ represents a hydrogen atom or a lower alkyl group), --O-- group, a ##STR5## group, or a --OCH₂ -- group, and m represents an integer of 0 or 2), and each of R², R³, R⁴, R⁵ and R⁶ may be a hydrogen atom. And R⁴ and R⁵, or R⁴ and R⁶ forms together with --(CH₂)_(n) -- (wherein n is an integer of 2 to 4), --CH₂ --O--CH₂ -- or --CH₂ --S--CH₂ --; provided, however, that at least one of R⁴, R⁵ and R⁶ is a hydrogen atom.

DESCRIPTION OF THE BACKGROUND

The compound of the formula (I) is a useful intermediate for the production of 1,3,5-thiadiazine-4-one, 2-imino-1,3,5-thiadiazine-4-one, imidazo- and pyrimido-1,3,5-thiadiazine-4-one, 5-phenoxy-phenyl-tetrahydro-1,3,5-thiadiazine-4-one, dihydro-1,3,5-thiadiazine-4-one and derivatives thereof, etc.

In the conventional methods for preparing the 1,3,5-thiadiazine-4-one derivatives, the end products have been prepared by reacting N-chloromethyl carbamoyl chloride with thiourea. In these methods, N-chloromethyl carbamoyl chloride is too reactive and very inconvenient in treatment due to its instability. Furthermore, there are many drawbacks to the conventional methods. For example, phosgene, which is very poisonous, is used for the production of N-chloromethyl carbamoyl chloride. Moreover, many isomeric compounds form when unsymmetric thiourea, which has different substituents, is a reactant, thereby resulting in poor product yield and a more complicated process especially with respect to product isolation.

SUMMARY OF THE INVENTION

The present inventors engaged in research in order to solve the above problems/disadvantages and concluded that 1,3,5-thiadiazine-4-one derivatives can be easily prepared with a high yield by cyclization in the presence, or in the absence of solvent of S-(N-alkoxycarbonyl, N-substituted)amino methyl isothiourea derivative of the present invention.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The present invention provides the compound of the formula (I) and the process thereof which comprises reacting the compound of formula (II) with thiourea of formula (III). ##STR6## In the above formulas, R¹, R², R³, R⁴, R⁵ and R⁶ are as defined above.

The compound of formula (I) according to the present invention can be prepared by reacting the compound of formula (II) with the compound of formula (III) in the presence or in the absence of a base within a temperature range of from -20° C. to 120° C. It is preferable, however, to proceed the reaction within a temperature range of 10° to 60° C.

The compound of formula (I), in which the radical R⁶ is a hydrogen atom, has tautomeric structures as follows: ##STR7##

The compound of formula (I) can be obtained in the form of a base or acid addition salt, if necessary. When a base is not added during the reaction, the product is obtained in the form of the salt, and when a base is added, it is obtained in the form of a free salt of isothiourea. When the acid is added to a free salt the product is obtained as the form of an acid addition salt thereof.

The reaction of the invention is preferably proceeded in the solvent which does not severely affect the reaction. Here, as the solvent, there may be employed water, an aliphatic hydrocarbon solvent such as hexane, cyclohexane, an aromatic hydrocarbon solvent such as benzene, toluene, xylene or chlorobenzene, a ketone solvent such as acetone, cyclohexanone, methylethyl ketone or methylisobutyl ketone, an ether solvent such as ethyl ether, isopropyl ether, dioxane or tetrahydrofuran, a halogenated hydrocarbon solvent such as methylene chloride, chloroform, tetrachloromethane, dichloroethane or trichloroethylene, an aliphatic ester solvent such as ethyl acetate, an aliphatic amide solvent such as acetonitrile, nitromethane, nitropropane, dimethylformamide or dimethylacetamide, an alcohol solvent such as ethanol, isopropanol or tert.-butanol, and dimethyl sulfoxide, etc. The above solvent may be used solely or in combination with water and/or other organic solvent solvents. However, the solvent is not restricted to such specific examples.

As the base, there may be employed an inorganic base such as potassium hydroxide, sodium hydroxide, aqueous ammonia, potassium carbonate, sodium carbonate, sodium bicarbonate, sodium phosphate, sodium biphosphate, borax, calcium hydroxide or calcium oxide, etc., or an organic base such as triethylamine, pyridine, 1,8-diazabicyclo[5,4,0,7]-undecene or triethylene-diamine, etc. These bases can be used in the form of powder or solution. The molar ratio of the reactant to starting material in the reaction is 1:1 which is stoichiometric amount. However, an excess amount of anyone can be used, unless the reaction is affected. The amount of the base can be one equivalent molar ratio to the reactants. An excess amount of the base does not harm the reaction. The amount of the solvent is not restricted. That is to say, an excess amount thereof may be used, and also only a small amount enough to agitate the reactants may be used. After the completion of the reaction, the compound of formula (I) is extracted from the reaction mixture by treating the appropriate solvent, washing, drying, and distilling the solvent, or if necessary, the conventional recrystallization or purification can be employed.

When the compound of the formula (I) is required to be obtained in the form of the salt thereof, the product is subjected to treatment with an appropriate acid. As an acid for preparing the salt thereof, there may be employed an inorganic acid or organic acid such as hydrochloric acid, hydrobromic, sulfuric acid, phosphoric acid, nitric acid, perchloric acid, acetic acid, formic acid, trichloroacetic acid, benzenesulfonic acid, toluene sulfonic acid, etc.

The typical compound of the formula (I) is shown in Table I.

      Substituent No. R.sup.1 R.sup.2 R.sup.3 R.sup.4 R.sup.5 R.sup.6      property  1 CH.sub.3 Ph H i-C.sub.3 H.sub.7 t-C.sub.4 H.sub.9 H liquid 2 C      .sub.2 H.sub.5 Ph H " " H 3 C.sub.3       H.sub.7 Ph H " " H 4                 i-C.sub.3 H.sub.7 Ph H " " H 5          n-Bu Ph H " " H 6      s-Bu Ph H " " H 7      t-Bu Ph H " " H 8      cyclohexyl Ph H " " H 9 CH.sub.2 Ph Ph H " " H liquid  10 CH.sub.3       ##STR8##       H " " H liquid  11 Ph Ph H " " H liquid       12      ##STR9##       Ph H " " H mp. 95˜97° C.       13      ##STR10##       Ph H " " H       14      ##STR11##       Ph H " " H       15      ##STR12##       Ph H " " H mp. 76˜78° C.       16      ##STR13##       Ph H " " H mp. 105˜106° C.       17      ##STR14##       Ph H " " H       18      ##STR15##       Ph H i-C.sub.3       H.sub.7                                                  t-C.sub.4      H.sub.9 H mp. 106˜108° C.       19      ##STR16##       " H " " H liquid  20 CH.sub.3 t-Bu H CH.sub.3  H 21 CH.sub.3 CH.sub.3      Ph i-C.sub.3       H.sub.7                                                     i-C.sub.3      H.sub.7 H 22 Ph C.sub.2       H.sub.5 H CH.sub.3                               t-C.sub.4 H.sub.9 H      23       ##STR17##       C.sub.2 H.sub.5 H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 H  24 Ph CH.sub.2      CHCH.sub.2 H CH.sub.3 CH.sub.3 H 25 PhNO.sub.2 CH.sub.2 CHCH.sub.2 H      CH.sub.3 i-C.sub.3 H.sub.7 H       26      ##STR18##       i-C.sub.3 H.sub.7 H CH.sub.3 CH.sub.3 H       27      ##STR19##       i-C.sub.3 H.sub.7 H CH.sub.3 i-C.sub.3 H.sub.7 H       28      ##STR20##       i-C.sub.3 H.sub.7 H C.sub.2 H.sub.5 C.sub.2 H.sub.5 H  29 CH.sub.3      n-C.sub.4 H.sub.9 H CH.sub.3 i-C.sub.3 H.sub.7 H 30 Me i-C.sub.4 H.sub.9      H      i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 H 31 PhNO.sub.2 SC.sub.4 H.sub.9 H      CH.sub.3 i-C.sub.3 H.sub.7 H 32 PhNO.sub.2 t-C.sub.4 H.sub.9 H CH.sub.3      n-C.sub.3 H.sub.7 H       33 " Ph H      ##STR21##       t-C.sub.4 H.sub.9 H       34 PhNO.sub.2 Ph H      ##STR22##      t-C.sub.4 H.sub.9 H       35 PhNO.sub.2 Ph H      ##STR23##       " H       36 PhNO.sub.2 Ph H      ##STR24##       " H       37 PhNO.sub.2 Ph H      ##STR25##       " H  38 CH.sub.2       Ph Ph H      ##STR26##       " H  39 C.sub.6       H.sub.4NO.sub.2 Ph H      ##STR27##       " H       40 " Ph H      ##STR28##       " H  41 " Ph H "  H 42 " i-C.sub.3 H.sub.7 H Ph CH.sub.3 H  43 " " H       ##STR29##       CH.sub.3 H  44 " t-C.sub.4       H.sub.9 H Ph CH.sub.3 H 45 " " H Ph i-C.sub.3 H.sub.7 H  46 " " H       ##STR30##       C.sub.2 H.sub.5 H       47 " " H      ##STR31##       CH.sub.3 H  48 C.sub.6 H.sub.4NO.sub.2 t-C.sub.4       H.sub.9 H      ##STR32##       CH.sub.3 H  49 " CH.sub.2       Ph H      ##STR33##       i-C.sub.3 H.sub.7 H  50 Me t-C.sub.8 H.sub.17 H Ph CH.sub.3 H 51 Et Ph      H CH.sub.3 H H  52 Ph Ph H C.sub.2       H.sub.5      ##STR34##       H  53 PhNO.sub.2 Ph H " i-C.sub.3 H.sub.7 H 54 PhNO.sub.2 Ph H "      t-C.sub.4 H.sub.9 H 55 CH.sub.3 Ph H n-C.sub.3 H.sub.7 n-C.sub.3 H.sub.7      H 56 PhNO.sub.2 Ph H " i-C.sub.3 H.sub.7 H 57 PhNO.sub.2 Ph H CH.sub.2   C      CHH.sub.2 CH.sub.2 CHCH.sub.2 H 58 PhNO.sub.2 Ph H " n-C.sub.3 H.sub.7 H      59 PhNO.sub.2 Ph H " i-C.sub.3 H.sub.7 H 60 PhNO.sub.2 Ph H " s-C.sub.3      H.sub.7 H 61 PhNO.sub.2 Ph H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 H 62      PhNO.sub.2 Ph H i-C.sub.4 H.sub.9 i-C.sub.4 H.sub.9 H 63 PhNO.sub.2 Ph H      " i-C.sub.3 H.sub.7 H 64 PhNO.sub.2 Ph H " t-C.sub.4 H.sub.9 H 65      PhNO.sub.2 Ph H s-C.sub.4 H.sub.9 s-C.sub.4 H.sub.9 H 66 PhNO.sub.2 Ph H      " t-C.sub.4 H.sub.9 H 67 PhNO.sub.2 Ph H i-C.sub.3 H.sub.7 t-C.sub.8      H.sub.17 H 68 PhNO.sub.2 Ph H CH.sub.2 Ph i-C.sub.3 H.sub.7 H 69      PhNO.sub.2 Ph H Ph C.sub.2 H.sub.5 H 70 PhNO.sub.2 4-ClPh H CH.sub.3      CH.sub.3 H 71 PhNO.sub.2 4-ClPh H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 H      72 PhNO.sub.2 4-ClPh H " t-C.sub.4 H.sub.9 H 73 PhNO.sub.2 4-ClPh H      s-C.sub.4 H.sub.9 s-C.sub.4 H.sub.9 H 74 PhNO.sub.2 4-ClPh H " t-C.sub.4      H.sub.9 H 75 PhNO.sub.2 3-ClPh H CH.sub.3 CH.sub.3 H 76 PhNO.sub.2      3-ClPh H C.sub.2 H.sub.5 t-C.sub.4 H.sub.9 H 77 PhNO.sub.2 3-ClPh H      CH.sub.2 CHCH.sub.2 i-C.sub.3 H.sub.7 H 78 PhNO.sub.2 3-ClPh H "      t-C.sub.4 H.sub.9 H 79 PhNO.sub.2 3-ClPh H " CH.sub.2 Ph H 80 PhNO.sub.2      3-ClPh H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 H 81 PhNO.sub.2 3-ClPh H "      t-C.sub.4 H.sub.9 H 82 PhNO.sub.2 3-ClPh H " t-C.sub.8 H.sub.17 H 83      PhNO.sub.2 3-ClPh H t-C.sub.4 H.sub.9 t-C.sub.4 H.sub.9 H 84 PhNO.sub.2      3-ClPh H s-C.sub.4 H.sub.9 s-C.sub.4 H.sub.9 H 85 PhNO.sub.2 3-ClPh H "      t-C.sub.4 H.sub.9 H 86 PhNO.sub.2 3-ClPh H CH.sub.3 OC.sub.3 H.sub.8      i-C.sub.3 H.sub.7 H 87 PhNO.sub.2 3-ClPh H CH.sub.3 OC.sub.2 H.sub.4      t-C.sub.4 H.sub.9 H       88 PhNO.sub.2 3-ClPh H      ##STR35##       i-C.sub.3 H.sub.7 H  89 PhNO.sub.2 3-ClPh H n-C.sub. 6 H.sub.13 " H 90      PhNO.sub.2 3-ClPh H CHPh " H 91 PhNO.sub.2      2-ClPh H C.sub.2 H.sub.5 t-C.sub.4       H.sub.9 H 92 PhNO.sub.2               2-ClPh H CH.sub.2 CHCH.sub.2      i-C.sub.3       H.sub.7 H 93 PhNO.sub.2                                        2-ClPh H      " t-C.sub.4       H.sub.9 H 94 PhNO.sub.2                                      2-ClPh H      i-C.sub.3 H.sub.7 t-C.sub.4       H.sub.9 H 95 PhNO.sub.2                      2-ClPh H " i-C.sub.3      H.sub.7 H 96 PhNO.sub.2      2-ClPh H s-C.sub.4 H.sub.9 s-C.sub.4       H.sub.9 H 97 PhNO.sub.2             2-ClPh H " t-C.sub.4 H.sub.9 H  98      PhNO.sub.2      2-ClPh H i-C.sub.3       H.sub.7      ##STR36##       H       99 PhNO.sub.2                                                        2-C      lPh H CH.sub.2 i-C.sub.3 H.sub.7 H       100 PhNO.sub.2                       2-ClPh H       ##STR37##       t-C.sub.4 H.sub.9 H       101 PhNO.sub.2                                     3-CF.sub.3 Ph H      s-C.sub.4 H.sub.9 t-C.sub.4 H.sub.9 H 102 PhNO.sub.2 4-FPh H H i-C.sub.3      H.sub.7 H 103 PhNO.sub.2 4-FPh H H t-C.sub.4 H.sub.9 H 104 PhNO.sub.2    P      4-Fh H C.sub.2 H.sub.5 " H 105 PhNO.sub.2 4-FPh H i-C.sub.3 H.sub.7      t-C.sub.4 H.sub.9 H 106 PhNO.sub.2 4-FPh H " " H 107 PhNO.sub.2 4-FPh H      s-C.sub.4 H.sub.9 " H 108 PhNO.sub.2 4-FPh H " " H 109 PhNO.sub.2 4-FPh      H CH.sub.3 CH.sub.2       CHCH.sub.2 H 110 PhNO.sub.2                          4-BrPh H CH.sub.3      CH.sub.3 H 111 PhNO.sub.2      4-BrPh H i-C.sub.3 H.sub.7 i-C.sub.3       H.sub.7 H 112 PhNO.sub.2            4-BrPh H " t-C.sub.4 H.sub.9 H 113      PhNO.sub.2      4-BrPh H s-C.sub.4       H.sub.9 " H 114 PhNO.sub.2                            2-CH.sub.3 Ph H      CH.sub.3 i-C.sub.3 H.sub.7 H 115 PhNO.sub.2 " H C.sub.2       H.sub.5 t-C.sub.4 H.sub.9 H 116 PhNO.sub.2 " H CH.sub.2 CHCH.sub.2      t-C.sub.4 H.sub.9 H 117 PhNO.sub.2 " H i-C.sub.3 H.sub.7 i-C.sub.3      H.sub.7 H 118 PhNO.sub.2 " H " t-C.sub.4 H.sub.9 H 119 PhNO.sub.2 " H      s-C.sub.4 H.sub.9 t-C.sub.4 H.sub.9 H 120 PhNO.sub.2 " H n-C.sub.6      H.sub.13 i-C.sub.3 H.sub.7 H  121 PhNO.sub.2 " H i-C.sub.3 H.sub.7       ##STR38##       H       122 PhNO.sub.2                                                       4-C      H.sub.3Ph H C.sub.2 H.sub.5 t-C.sub.4 H.sub.9 H 123 PhNO.sub.2 " H      n-C.sub.3 H.sub.7 i-C.sub.3       H.sub.7 H 124 PhNO.sub.2                     4CH.sub.3Ph H CH.sub.2      CHCH.sub.2 i-C.sub.3 H.sub.7 H 125 PhNO.sub.2 " H i-C.sub.3 H.sub.7      i-C.sub.3 H.sub.7 H 126 PhNO.sub.2 " H n-C.sub.3 H.sub.7 t-C.sub.4      H.sub.9 H 127 PhNO.sub.2 " H i-C.sub. 3 H.sub.7 t-C.sub.4 H.sub.9 H 128      PhNO.sub.2 " H s-C.sub.4 H.sub.9 t-C.sub.4 H.sub.9 H 129 PhNO.sub.2 " H      CH.sub.2 Ph i-C.sub.3       H.sub.7 H 130 PhNO.sub.2                           3CH.sub.3 Ph H      C.sub.2 H.sub.5 C.sub.2 H.sub.5 H 131 PhNO.sub.2 " H i-C.sub.3 H.sub.7      i-C.sub.3 H.sub.7 H 132 PhNO.sub.2 " H i-C.sub.3 H.sub.7 t-C.sub.4      H.sub.9 H 133 PhNO.sub.2 " H s-C.sub.4 H.sub.9 s-C.sub.4 H.sub.9 H 134      PhNO.sub.2 " H " t-C.sub.4 H.sub.9 H 135 PhNO.sub.2 4C.sub.2 H.sub.5 Ph      H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 H 136 PhNO.sub.2 " H " t-C.sub.4      H.sub.9 H 137 PhNO.sub.2 " H s-C.sub.5 H.sub.9 t-C.sub.4 H.sub.9 H 138      PhNO.sub.2 2C.sub.2 H.sub.5 Ph H CH.sub.2 CHCH.sub.2 i-C.sub.3 H.sub.7 H      139 PhNO.sub.2 " H i-C.sub.3 H.sub.7 i-C.sub. 3 H.sub.7 H 140 PhNO.sub.2      " H " t-C.sub.4 H.sub.9 H 141 PhNO.sub.2 " H s-C.sub.4 H.sub.9 " H 142      PhNO.sub.2 2-i-C.sub.3 H.sub.7 Ph H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7      H 143 PhNO.sub.2 2-i-C.sub.3 H.sub.7 Ph H i-C.sub.3 H.sub.7 t-C.sub.4      H.sub.9 H 144 PhNO.sub.2 " H s-C.sub.4 H.sub.9 t-C.sub.4 H.sub.9 H 145      PhNO.sub.2 4-CH.sub.3 OPh H CH.sub.2 CHCH.sub.2 i-C.sub.3 H.sub.7 H 146      PhNO.sub.2 " H n-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 H 147 PhNO.sub.2 " H      i-C.sub.3 H.sub.7 t-C.sub.4 H.sub.9 H  148 PhNO.sub.2 " H n-C.sub.3      H.sub.7       ##STR39##       H  149 PhNO.sub.2 " H s-C.sub.4 H.sub.9 t-C.sub.4 H.sub.9 H 150      PhNO.sub.2 2-CH.sub.3 OPh H i-C.sub.3 H.sub.7 " H 151 PhNO.sub.2      4-NO.sub.2 Ph H i-C.sub.3 H.sub.7 H H 152 PhNO.sub.2 2,4(CH.sub.3).sub.2      Ph H CH.sub.3 i-C.sub.3 H.sub.7 H 153 PhNO.sub.2 " H i-C.sub.3 H.sub.7      i-C.sub.3 H.sub.7 H 154 PhNO.sub.2 " H " t-C.sub.4 H.sub.9 H 155      PhNO.sub.2 " H s-C.sub.4 H.sub.9 " H 156 PhNO.sub.2 2,4(CH.sub.3).sub.2      Ph H i-C.sub.3 H.sub.7 i-C.sub.3       H.sub.7 H 157 PhNO.sub.2 " H " t-C.sub.4 H.sub.9 H 158 PhNO.sub.2 " H      s-C.sub.4 H.sub.9 " H 159 PhNO.sub.2 2CH.sub.3,4ClPh H i-C.sub.3 H.sub.7      t-C.sub.4 H.sub.9 H 160 PhNO.sub.2 2,6(CH.sub.3).sub.2 Ph H " " H 161      PhNO.sub.2 2,6Et.sub.2 Ph H " i-C.sub.3 H.sub.7 H 162 PhNO.sub.2      2,4Cl.sub.2 Ph H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 H 163 PhNO.sub.2 "      H " t-C.sub.4 H.sub.9 H 164 PhNO.sub.2 " H s-C.sub.4 H.sub.9 s-C.sub. 4      H.sub.9 H 165 PhNO.sub.2 " H " t-C.sub.4 H.sub.9 H 166 PhNO.sub.2      3,5Cl.sub.2 Ph H i-C.sub.3 H.sub.7 " H 167 PhNO.sub.2 " H CH.sub.2      CHCH.sub.2 i-C H H 168 PhNO.sub.2 " H " t-C.sub.3       H.sub.7 H 169 PhNO.sub.2 " H " t-C.sub.4 H.sub.9 H 170 PhNO.sub.2      2,5Cl.sub.2 Ph H " " H 171 PhNO.sub.2 " H s-C.sub.3 H.sub.7 " H 172      PhNO.sub.2 Ph H CH.sub.2CH.sub.2 H  173 PhNO.sub.2 " H CH.sub.2 CH.sub.2      CH.sub.2 H 174 PhNO.sub.2 2ClPh H CH.sub.2 CH.sub.2 H 175 PhNO.sub.2      4ClPh H CH.sub.2 CH.sub.2 H       176 PhNO.sub.2 4FPh H      ##STR40##       H       177 PhNO.sub.2 " H      ##STR41##       H  178 PhNO.sub.2 2,3,6-Me.sub.3 Ph H CH.sub.2 CH.sub.2 H          179      PhNO.sub.2       ##STR42##       H i-C.sub.3 H.sub.7 t-C.sub.4 H.sub.9       180 PhNO.sub.2      ##STR43##       H i-C.sub.3 H.sub.7 t-C.sub.4 H.sub.9       181 PhNO.sub.2      ##STR44##       H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7       182 PhNO.sub.2      ##STR45##       H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7       183 PhNO.sub.2      ##STR46##       H i-C.sub.3 H.sub.7 i-C.sub.4 H.sub.9       184 PhNO.sub.2      ##STR47##       H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7  185 Ph Ph H H t-Bu H 186 Ph Ph H      H t-Bu CH       187 Ph CH.sub.2CHCH.sub.2 H H CH.sub.3      ##STR48##        188 PhNO.sub.2 CH.sub.3 Ph i-C.sub.3 H.sub.7 t-Bu H     t-Bu 189      PhNO.sub.2 " Ph CH.sub.3 C.sub.2 H.sub.5 H 190 PhNO.sub.2 " PhCl      CH.sub.3 CH.sub.3 H 191 PhNO.sub.2 CH.sub.3 PhCl CH.sub.3 i-C.sub.3      H.sub.7 H 192 PhNO.sub.2 CH.sub.3 PhOCH CH.sub.3 i-C.sub.3 H.sub.7 H 193      PhNO.sub.2 CH.sub.2CHCH.sub.2 Ph CH.sub.3 CH.sub.3 H 194 PhNO.sub.2 PhCH      PhCl CH.sub.3 CH.sub.3 H 195 Ph PhCl H H CH.sub.3 CH.sub.3  196 Ph      t-C.sub.4       H.sub.9 H H CH.sub.3      ##STR49##        197 Ph t-C.sub.4 H.sub.9 H H CH.sub.3 CH.sub.3 198 Ph Ph H H CH.sub.3      Ph 199 Ph PhCl H H CH.sub.3 Ph 200 Ph PhCl H H CH.sub.2 CH.sub.2      CH.sub.2 CH.sub.2       201 Ph PhCl H H CH.sub.3      ##STR50##        202 Ph PhCl H H C.sub.2 H.sub.5 Ph 203 Ph PhCF.sub.3 H H CH.sub.2      CH.sub.2 CH.sub.2 CH.sub.2       204 Ph PhCF.sub.3 H H CH.sub.3      ##STR51##        205 Ph PhCl.sub.2 H H i-C.sub.3 H.sub.7 i-C.sub.3 H.sub.7 206 Ph      PhCl.sub.2 H H CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 207 PhNO.sub.2 Ph H H      H H HCl Salt        m.p. 164-167°       C.

Most of the compounds of formula (II) can be easily prepared by the conventional methods and also some are published, for example, in the U.S. Pat. No. 2,131,362, British Patent No. 1,339,116 and British Patent No. 1,350,528.

The compound of formula (III) also can be easily prepared by the conventional methods in the art.

As described in the above, 1,3,5-thiadiazine-4-one derivatives can be easily prepared by using the compound of the present invention. For example, 1,3,5-thiazine-4-one derivatives is obtained by cycling the compound of the formula (I) in the absence of the solvent, preferably in the presence of the appropriate solvent, within a temperature range of 0° C. to 150° C., preferably 20° C. to 100° C. The reaction can be proceeded in the presence of an afore-mentioned base. The final product, 1,3,5-thiadiazine-4-one derivatives can be separated and/or purified by the conventional methods, if necessary.

Other features of the invention will become apparent in the course of the following description of the exemplary embodiments which are given for illustration of the invention and are not intended to be limiting thereof.

EXAMPLE 1 Preparation of p-nitrophenyl N-[N'-t-butyl, N"-isopropyl isothioureido] methyl-N-phenylcarbamate

To a solution of 3.0 g of p-nitrophenyl N-chloromethyl N-phenylcarbamate and 1.8 g of N-isopropyl, N'-t-butyl thiourea in 30.0 ml of toluene, 3.0 g of calcium hydroxide was added and the mixture stirred at room temperature for 5 hours. The resulting product was separated by filtration and was crystallized from the mixture of hexane and ethyl acetate. 4.04 g of the product was obtained: m.p. 105°-106° C.

EXAMPLE 2 Preparation of alpha-naphthyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenylcarbamate

To 20 ml of dichloroethane, 3.0 g of alpha-naphthyl N-chloromethyl N-phenyl carbamate, 1.3 ml of triethylamine and 1.8 g of N-isopropyl N'-t-butyl thiourea was added, and the mixture was stirred at room temperature for 3 hours. The resulting mixture was washed with 20 ml of water three times and dried over sodium sulfate. Thereafter, the solution was removed, and the resulting product was crystallized from isopropyl alcohol. 3.3 g of the product was obtained: m.p. 106°-108° C.

EXAMPLE 3 Preparation of p-bromophenyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenyl carbamate.

To 20 ml of dichloroethane, 3.4 g of p-bromophenyl N-chloromethyl-N-phenyl carbamate, 1.3 ml of triethyl amine and 1.8 g of N-isopropyl N'-t-butyl thiourea were added, and the mixture was stirred at room temperature for 1 hour. The resulting mixture was washed with 20 ml of water three times and subsequently dried over sodium sulfate. The solvent was removed and the resulting product was crystallized from isopropyl alcohol. 3.9 g of the product was obtained: m.p. 76°-78° C.

EXAMPLE 4 Preparation of methyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenyl carbamate

To 20 ml of dichloroethane, 1.9 g of methyl N-chloromethyl N'-phenyl carbamate, 1.3 ml of triethylamine and 1.8 g of N-isopropyl N'-t-butylthiourea were added and the mixture was stirred at room temperature for 1 hour. The solvent was removed, and the residue was purified by silica gel column chromatography to obtain 2.4 g of the product as liquid:

NMR(CDCl₃): 0.97-1.07(d,6H), 1.3(s,9H), 3.5(s,3H), 4.45-4.75 (m,1H), 5.05(s,2H), 7.3(s,5H).

EXAMPLE 5 Preparation of p-chlorophenyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl N-phenylcarbamate

To 20 ml of dichloroethane, 2.9 g of p-chlorophenyl N-chloromethyl-N-phenyl carbamate, 1.3 mo of triethyl amine and 1.8 g of N-isopropyl N'-t-butylthiourea were added, and the mixture was stirred at room temperature for 1.5 hours. The resulting mixture was washed with 20 ml of water and dried over sodium sulfate. The solvent was removed, and the residue was crystallized from isopropyl alcohol to obtain 3.57 g of the titled compound: m.p. 95°-97° C.

EXAMPLE 6 Preparation of benzyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl N-phenylcarbamate

To 10 ml of dichloromethane, 2.8 g of benzyl N-chloromethyl-N-phenylcarbamate and 1.5 g of N-t-butyl-N'-isopropylthiourea were added, and the mixture was stirred at room temperature for 30 minutes. Then, 1.4 ml of triethylamine was added dropwise over 5 minutes to the above mixture. After 4 hours, the mixture was washed with 20 ml of water and dried over sodium sulfate. After filtration of the mixture, the solvent was removed to obtain the orange liquid, which was purified by silica gel column chromatography to obtain 2.2 g (yield: 54%, liquid) of the product:

NMR(CDCl₃): 0.95-1.15(d,6H), 1.3(s, 9H), 5.0(s, 2H), 5.07(s, 2H), 7.15(s, 5H).

EXAMPLE 7 Preparation of methyl N-[N'-t-butyl, N"-isopropylisothio ureido]methyl N-2,2-dimethyl 2,3-dihydrobenzofuran-7-yl carbamate

To 15 ml of dichloromethane, 1.7 g of phenyl N-chloromethyl-N-2,2-dimethyl-2,3-dihydrobenzofuran-7-yl carbamate and 0.087 g of N-t-butyl-N'-isopropyl isothiourea were added, and the mixture was stirred at room temperature for 20 minutes, to which 0.7 ml of triethylamine was added. The mixture was again stirred at the same temperature and dried over sodium sulfate. After filtration of the mixture, the solvent was removed to obtain the dark red liquid, which is subjected to silica gel column chromatography to obtain 1.3 g of the product as yellow liquid:

NMR(CDCl₃): 1.1-1.25(d, 6H), 1.45(s, 9H), 3.0(s, 6H), 5.05(s, 2H), 5.1(s, 2H), 6.8-7.2(m, 8H).

EXAMPLE 8 Preparation of phenyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl N-phenyl carbamate

To 15 ml of dichloroethane, 2.6 g of phenyl N-chloromethyl-N-phenyl carbamate and 1.7 g of N-t-butyl-N'-isopropyl thiourea were added, and the mixture was stirred at room temperature for 20 minutes, to which 1.4 ml of triethylamine was added, and then the mixture was again stirred at the same temperature for 2 hours. The mixture was washed with 20 ml of water and dried over sodium sulfate. After filtration, the solvent was removed to obtain yellowish red liquid, which is subjected to silica gel column chromatography to obtain 2.3 g (yield: 54%) of the product:

NMR(CDCl₃): 1.1-1.25(d, 6H), 1.45(s, 9H), 3.0(s, 6H), 5.05(s, 2H), 5.1(s, 2H), 6.8-7.2(m, 8H).

EXAMPLE 9 Preparation of 2,2-dimethyl-2,3-dihydro-benzofuran-7-yl N-[N'-t-butyl,N"-isopropyl isothioureido]methyl N-phenyl carbamate

To 15 ml of dichloroethane, 3.3 g of 2,2-dimethyl-2,3-dihydrobenzofuran-7-yl N-chloromethyl-N-phenyl carbamate and 1.7 g of N-t-butyl N'-isopropylthiourea were added, and the mixture was stirred at room temperature for 20 minutes, to which 1.5 ml of triethylamine was added and then was again stirred for 1 hour. The resulting mixture was washed with 20 ml of water, and dried over sodium sulfate. After filtration, the solvent was removed to obtain the dark red liquid, which is purified by silica gel column chromatography to form 2.5 g (yield: 53%) of the product as yellow liquid:

NMR(CDCl₃): 1.0-1.15(d, 6H), 1.3(s, 9H), 3.0(s, 6H), 5.0(s, 2H), 5.1(s, 2H), 6.5-7.2(m, 8H).

EXAMPLE 10 Preparation of 2-t-butylimino-3-isopropyl-5-phenyl-3,4,5,6-tetrahydro-2H-1,3,5-thiadiazine-4-one

To 2 ml of dichloroethane, 4.4 g of p-nitrophenyl-N-[N'-t-butyl,N"-isopropyl isothioureido]methyl-N-phenyl carbamate and 1 ml of triethylamine were added, and the mixture was refluxed under heating for 2 hours. After cooling to room temperature, the reaction solution was washed with 20 ml of 5% aqueous sodium hydroxide solution, and subsequently washed with 20 ml of water. The resulting organic layer was dried over sodium sulfate and removed the solvent. The residue was crystallized from isopropyl alcohol to obtain 2.72 g of the final product: m.p. 103°-104° C.

EXAMPLE 11 Preparation of 2-t-butylimino-3-isopropyl-5-phenyl-3,4,5,6-tetrahydro-2H-thiadiazine-4-one

To 2 ml of water and 2 ml of dichloromethane, 4.44 g of p-nitrophenyl N-[N'-t-butyl N"-isopropyl-isothioureido]methyl-N-phenyl carbamate and 0.4 g of sodium hydroxide were added, and the mixture was heated to 40° C. and stirred at the same temperature for 3 hours. After cooling to room temperature, the organic layer separated was dried and the solvent was distilled off under the reduced pressure. The residue was subjected to crystallize from the isopropyl alcohol to obtain 2.79 g of the product: m.p. 103°-104° C.

EXAMPLE 12 Preparation of 2-t-butylimino-3-isopropyl-5-phenyl-3,4,5,6-tetrahydro-2H-1,3,5-thiadiazine-4-one

To a solution of 0.4 g of p-nitrophenyl N-[N'-t-butyl,N"-isopropyl-isothioureido]methyl N-phenylcarbamate in 5 ml of acetonitrile, 0.4 g of calcium hydroxide was added, and the mixture was stirred at room temperature for 24 hours, 2.7 g of the product was prepared in the same manner as in Example 11: m.p. 103°-104° C.

EXAMPLE 13 Preparation of p-nitrophenyl N-isothioureidomethyl, N-phenyl carbamate. hydrochloride.

To 25 ml-flask, 1.16 g of p-nitrophenyl N-chloromethyl N-phenylcarbamate, 0.5 g of thiourea and 10 ml of methylene chloride were added, and the mixture was stirred at room temperature for 5 hours. The resulting white precipitates were filtered, washed with 15 ml of ethyl acetate, and dried to obtain 1.3 g of the product: 164°-167° C. (decompose).

NMR(CDCl₃): 5.65(s, 2H), 7.5(m, 7H), 8.28(d, 2H), 9.3(s, 2H), 9.5(s, 2H). 

What is claimed is:
 1. An S-(N-alkoxycarbonyl, N-substituted)aminomethyl isothiourea derivative of the following formula: ##STR52## wherein: (a) R¹ represents an alkenyl group, an alkynyl group, a haloalkenyl group, a haloalkynyl group, an alkoxyalkyl group, a cycloalkyl group, a cycloalkenyl group, a naphthyl, a pyridyl, ##STR53## (b) each of R², R³, R⁴, R⁵ and R⁶, which may be the same or different, represents a lower alkyl group, an alkenyl group, an alkynyl group, a haloalkyl group, a haloalkenyl group, a haloalkynyl group, an alkoxyalkyl group, a cycloalkyl group, a cycloalkenyl group, a naphthyl, a pyridyl, ##STR54## (c) each of R², R³, R⁴, R⁵, and R⁶ also may be a hydrogen; and(d) R⁴ and R⁵ or R⁴ and R⁶ may form --(CH₂)_(n) -- (wherein n is an integer of 2 to 4), --CH₂ --O--CH₂ --, or --CH₂ --S--CH₂ --; (e) each of X¹, X², and X³, which may be the same or different, represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, an acetyl, a haloalkyl group, a halogen atom, CF₃, NO₂, hydroxy, a benzyl, halogen-substituted benzyl, phenyl, phenoxy or phenylthio group; (f) each of Y¹ and Y², which may be the same or different, represents a hydrogen atom, a lower alkyl group, a halogen atom, CF₃, a lower alkoxy group; (g) W represents a ##STR55## group, a --O-- group, a ##STR56## group, or a --OCH₂ -- group, and m represents an integer of 0 to 2; (h) each of R⁷ and R⁸ represents a hydrogen atom or a lower alkyl group; provided (i) at least one of R⁴, R⁵, and R⁶ is a hydrogen.
 2. The S-(N-alkoxycarbonyl, N-substituted)aminomethyl isothiourea derivative according to claim 1 wherein R³ is hydrogen.
 3. The S-(N-alkoxycarbonyl, N-substituted)aminomethyl isothiourea derivative according to claim 1 wherein R³ is a lower alkyl group, an alkenyl group, an alkynyl group, a haloalkyl group, a haloalkenyl group, a haloalkynyl group, an alkoxyalkyl group, a cycloalkyl group, a cycloalkenyl group, a naphthyl, a pyridyl, ##STR57##
 4. The S-(N-alkoxycarbonyl, N-substituted)aminomethyl isothiourea derivative according to claim 3 wherein R³ is a naphthyl, a pyridyl, ##STR58##
 5. The S-(N-alkoxycarbonyl, N-substituted)aminomethyl isothiourea derivative according to claim 1 wherein R² is a naphthyl, a pyridyl, ##STR59##
 6. An S-(N-alkoxycarbonyl, N-substituted)aminomethyl isothiourea derivative according to claim 1 wherein R⁴ and R⁵ are lower alkyl groups.
 7. The S-(N-alkoxycarbonyl, N-substituted)aminomethyl isothiourea derivative according to claim 6 wherein:(a) R¹ and R² represents a naphthyl, a pyridyl, ##STR60## and (b) R³ is hydrogen.
 8. S-(N-alkoxy carbonyl, N-substituted)amino methyl isothiourea derivative according to claim 1, which is p-nitrophenyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenyl carbamate.
 9. S-(N-alkoxy carbonyl, N-substituted)amino methyl isothiourea derivative according to claim 1, which is alpha-naphthyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenyl carbamate.
 10. S-(N-alkoxy carbonyl, N-substituted)amino methyl isothiourea derivative according to claim 1, which is p-bromophenyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenyl carbamate.
 11. S-(N-alkoxy carbonyl, N-substituted)amino methyl isothiourea derivative according to claim 1, which is p-chlorophenyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenyl carbamate.
 12. S-(N-alkoxy carbonyl, N-substituted)amino methyl isothiourea derivative according to claim 1, which is benzyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenyl carbamate.
 13. S-(N-alkoxy carbonyl, N-substituted)amino methyl isothiourea derivative according to claim 1, which is phenyl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl-N-phenyl carbamate.
 14. S-(N-alkoxy carbonyl, N-substituted)amino methyl isothiourea derivative according to claim 1, which is p-nitrophenyl[N-isothioureido]methyl N-phenyl carbamate.hydrochloride.
 15. An S-(N-alkoxy carbonyl, N-substituted)amino methyl isothiourea derivative 2,2-dimethyl-2,3-dihydrobenzofuran-7yl N-[N'-t-butyl, N"-isopropyl isothioureido]methyl N-phenyl carbamate. 